Sickle-grinder



(No Model.)

H. THI-BAULT. SIGKLB GRINDER.

No. 416,518. Patented Dec. 3, 1889'.

314 0 @wto a o e mTy u. PETERS. Phmumo nmr, Washington. ac.

UNITED STATES PATENT OFFICE HENRY THIBAULT, OF STOCKTON, CALIFORNIA.

SlCKLE-GRINDER.

SPECIFICATION forming part of 'Letters Patent No. 416,518, dated December 3, 1889.

Application filed July 19, 1889. Serial No. 318,083- (No model.)

0 To all whom it may concern.-

Be it known that I, HENRY THIBAULT, of Stockton, San Joaquin county, State of California, have invented an Improvement in Sickle-Grinders; and I hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to the general class of grinding implements, and particularly to that class specially adapted for sickle-grinding; and my invention consists in the novel constructions and arrangements hereinafter described, and specifically pointed out in the claims.

The object of my invention is to provide a simple and effective grinder for general purposes, but especially for sickle grinding.

Referring to the accompanying drawings for a more complete explanation of my invention, Figure 1 is a perspective view of my grinder. Fig. 2 is a section of the stone, showing the manner of securing it on the shaft. Fig. 3 is an elevation of stone and shaft and a section of sleeve J.

A is the frame of the machine, carrying on its top a plate B, having side flanges 19, which form a kind of housing for the stone, and also rests for the sickle or other blade to be ground. Between these flanges is the stone Cin practice a corundum stone.the top 0 of which, when used for sicklegrinding, is made conical to a greater or less extent, as may be desired. This stone is mounted, in a manner presently to be described, upon the top of the spindle or shaft D, which passes down through the' plate B.

Mounted in the frame A is a shaft E, which carries a large spur-gearF,w11ich serves also as a fly-wheel. The shaft E also carries a small pinion e, and this pinion meshes with a gear G on a counter-shaft g above, said gear having a crank or wrist pin g, mounted and adapted to be adjusted in an elongated slot g whereby the throw of said pin may be varied as may be desired. With this wrist-pin is connected the rod 11, which extends downwardly to a treadle I.

Journaled between the two supports ct on the main frame is a sleeve J, which carries at its top a beveled pinion j, which meshes with the spur-gear F. The shaft D, which carries the stone, passes down through th'. sleeve and is connected with it, so as to re ceive rotation therefrom, by means of a pin (1, connected with the shaft and extending outwardly through an elongated slot j in the sleeve. This connection, while adapting the shaft D to be rotated by the sleeve J, also provides for the vertical movement of said shaft in the sleeve, and this movement is controlled and regulated by means of the spring K around the shaft, the upper end of which bears again st the adjustable collar is, whereby its tension is regulated. The spring K holds the shaft D normally up, thereby keeping the stone 0 up to its normal position of work, though the stone may be pressed downwardly, so as to condense the spring sufficiently to provide for the constant pressure of the stone against the sickle. This pressure may be regulated by adjusting the tension of the spring by the collar 76.

To reduce the friction caused by the vertical movement of the shaft D, I mount upon its pin d an anti-friction roller (1, which travels in the slot j, the walls of which are flanged or widened to provide a suitable bearing-surface for the roller, and also to allow said roller to be carried out as far as possible from the shaft D to further reduce the friction.

The manner of securing the stone 0 to the shaft D is as follows: A dovetailed socket c is made centrally in the undeI-side of the stone,

and into this socket is inserted the upper threaded. end (1 of shaft D. Then Babbitt metal (1 is poured in around the shaft end, and conforming to the thread of the shaft forms a fixed nut, in which said shaft is seated. A jam-nut d is seated on end (1 and when run up holds the shaft and stone together.

In using the grinder any suitable support may be used for holding the sickle, which is sharpened by fitting the adjacent edges of the teeth to the conical top 0 of .the stone. This top 0, for use on the sickles of mowers, is to be made quite conical, so as to suit the required bevel of said sickles; but for the sickles of harvesters the top 0 need be but slightly conical, as in Fig. 2, or flat, in which latter case the stone may be used for general grinding work.

The operation of the grinder is obvious. The blade to be ground is supported by the flanges b of the top plate, and presses down on the stone, which, by means of the treadle and intervening gears, is rotated. The pressure down upon the stone causes the spring K to condense and to bear upwardly, so as to hold the stone constantly and with required pressure to its work. In grinding sickles it is of great importance that the pressure of the stone be nicely regulated. This I effect perfectly by the collar 7:, by which I accurately regulate the tension of the spring.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a grinder, the combination of the grinding-stone having a conical top, a verti (rally-movable spring-controlled shaft carrying said stone, and a rotary sleeve in which the shaft is mounted, substantially as described.

2. In a grinder, the frame having a top plate with flanges to support the blade to be ground, in combination with the stone within the top flanged plate, and the vertically-movable spring-controlled rotary shaft carrying the stone, substantially as described.

3. In a grinder, the combination of the comically-topped grinding-stone, a flanged support for the blade to be ground, the verticallyaiiovable shaft carrying said stone, a sleeve, whereby said shaft is rotated, and the spring encircling the shaft to effect its vertical movement and hold the stone to its work, substantially as described. I

4C. In a grinder, the stone and the vertically-rnovable shaft carrying and rotating said stone, in combination with the rotary sleeve in which the shaftis mounted, the adjustable connection between said sleeve and the shaft, whereby the latter is rotated and may have its vertical movement, and the spring for controlling the said vertical movement, substantially as described.

5. In a grinder, the stone and the vertically movable shaft carrying said stone, in combination with the rotary sleeve in which the shaft is mounted,the pin-and-slot connection between said sleeve and shaft, whereby the latter is rotated and may have its vertical movement, the spring for cdntrolling said vertical movement, the pinion on the sleeve, the spur-gear engaging the pinion, the small pinion on the shaft of the spur-gear, the crankpinion engaging said small pinion, and the threaded connection, substantially as described.

6. In a grinder, the stone and the vertically-movalzile shaft carrying said stone, in combination with the rotary sleeve having an elongated slot, the pin on the shaft fittin and playing in said slot and having an 3.111111 friction-roller, and the spring on the shaft for controlling its vertical movement, substantially as described.

7. A grinder consisting of the combination of the frame having a flanged top plate, a rotary slotted sleeve carried by the frame and having a pinion, the stone within the flanged top plate, the shaft carrying the stone and having a pin fitting and playing in the slot of the sleeve, the spring controlling the vertical movement of the shaft, a spur-gear engaging the pinion of the sleeve, and gearing and treadle connection, whereby the spurgear is driven, substantially as described.

In witness whereof I have hereunto set my hand.

HENRY 'lIIIIL XUL'I. Witnesses:

S. II. NoURsn, ll. (1. LEE. 

